Having spent more than 21 years at engineering consultancy WS Atkins, Mr Sowerby joins the Group having trained with KPMG and most recently as finance director of Faithful+Gould.
Andy Radcliffe, Chief Executive of Esh Group, said: "Mark is a fantastic addition to the Esh Group team which includes a broad range of experience at the top tier of industry.
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"His knowledge will help Esh to retain and build on its longstanding strong financial position. Our business is built on skilled people who are committed to constructing communities."
Mr Sowerby said: "I'm delighted to join Esh Group – a trusted construction name with a strong record in delivering value for communities.
"Esh Group's rich portfolio of projects across the North East, North West, Yorkshire and Scotland make it an exciting time to join the business and its highly committed team.
"I look forward to playing a significant role in the ongoing success of Esh Group for its clients, staff and partners."
(LM)
